• Needle valves have a slender, tapered point at the end of the valve stem that is lowered through the seat to restrict or block flow.
• Fluid flowing through the Needle valve turns 90 degrees and passes through an orifice that is the seat for a rod with a cone shaped tip.
• Needle valves are widely used to accurately regulate the flow of liquids and gases at low flow rates.
• The fine threading of the stem and the large seat area allow for precise resistance to flow.
• Needle valves are used to control flow into delicate gauges,which might be damaged by sudden surges of fluid under pressure.
• Needle valves are also used in situations where the flow must be gradually brought to a halt, and at other points where precise adjustments of flow are necessary or where a small flow rate is desired.
• Needle valves can be used as both on/off valves and for throttling service.
• Needle valves are often designed with a metal needle (generally brass, bronze, or stainless or other alloys of steel) and an elastomeric seat (generally PVC, CPVC, PTFE, or a wide range of brand name plastics and thermoplastics).
• While this is the most common form, valves are available that have metal - metal, plastic - plastic, or plastic- metal needles and seats.
• These variations are usually designed with specific applications in mind, especially situations where corrosion, high or low temperatures or extensive wear are possible.
• In such cases, it is best to consult with the manufacturer to find which type of valve is best for the application at hand.
• Needle valves are used in almost every industry in an incredibly wide range of applications - anywhere control or metering of steam, air, gas, oil, water or other non-viscous liquids is required.
• Needle valves can be found in every industry from aerospace to zoological sciences, every service from gas and liquid dispensation to instrumentation control and cooling to power generation.
• However, Needle valves should be avoided in applications where the media is viscous, or in the dispensation of slurries.
• The small flow orifice can easily trap thick materials or solids and become blocked.
• VE-LOCK® Brand Make Needle valves are available in materials like - Steel, Stainless Steel, Brass, Monel, & various Alloy & Non Alloy steel
• VE-LOCK® manufacturer Needle valves with Low pressure design up to 3000 Psi, High Pressure design up to 6000 psi & Very High Pressure Design up to 10000 psi ( On Request Only)